I will be looking to do a swap later in the week. I got a ticket in 135 lower tier and looks like my lad is going to get a ticket in the third tier, so wil need to swap one way or the other. With regards to any tickets being concessions, I wouldn't worry about that, as the only difference is that the club write concession on one side of the ticket, very easy to wipe off with nail varnish remover etc, or turn it into an autograph!!!!! Rest of the ticket, including the official bits are all the exact same, concession or not.